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02193 Corrosion Performance of AI 2519 in Marine Environments

Structural, ballistic, and mobility requirements have led to the selection of aluminum alloy 2519 as the primary structural material for the Advanced Amphibious Assault Vehicle (AAAV).  Two-year seawater alternate immersion exposures of welded AI 2519 panels with and without protective coatings were conducted to simulate the expected AAAV service environment.

Product Number: 51300-02193-SG
ISBN: 02193 2002 CP
Author: Richard A. Hays, Edward B. Bieberich, and Andrew D. Sheetz
Publication Date: 2002
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Structural, ballistic, and mobility requirements have led to the selection of aluminum alloy 2519 as the primary structural material for the Advanced Amphibious Assault Vehicle (AAAV). AI 2519 is a relatively new copper precipitation-strengthened alloy designed for strength and ballistic properties. There is very little seawater corrosion data for this alloy but the composition and recent test results suggest that it will show susceptibility to pitting in marine environments. Two-year seawater alternate immersion exposures of welded AI 2519 panels with and without protective coatings were conducted to simulate the expected AAAV service environment. Results show that unprotected AI 2519 is susceptible to uniformly dispersed, shallow pitting under these conditions. Deeper pitting occurred under coating failures. No accelerated attack of the weld metal or heat affected zones was observed. Cathodic protection applied during the immersion cycles drastically improved performance of all the coatings and reduced the corrosion rate of the unprotected material.

Keywors: Al 2519, seawater corrosion, protective coatings

Structural, ballistic, and mobility requirements have led to the selection of aluminum alloy 2519 as the primary structural material for the Advanced Amphibious Assault Vehicle (AAAV). AI 2519 is a relatively new copper precipitation-strengthened alloy designed for strength and ballistic properties. There is very little seawater corrosion data for this alloy but the composition and recent test results suggest that it will show susceptibility to pitting in marine environments. Two-year seawater alternate immersion exposures of welded AI 2519 panels with and without protective coatings were conducted to simulate the expected AAAV service environment. Results show that unprotected AI 2519 is susceptible to uniformly dispersed, shallow pitting under these conditions. Deeper pitting occurred under coating failures. No accelerated attack of the weld metal or heat affected zones was observed. Cathodic protection applied during the immersion cycles drastically improved performance of all the coatings and reduced the corrosion rate of the unprotected material.

Keywors: Al 2519, seawater corrosion, protective coatings

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